Even if your body has more of these muscle-building hormones like testosterone and IGF-1, it doesn’t mean you’ll grow bigger muscles from lifting weights over 12 weeks.
Claim Language
Language Strength
association
Uses association language (linked to, correlated with)
The claim uses the phrase 'are not associated with,' which explicitly frames the relationship as a lack of correlation or statistical link, not causation or probability. This is characteristic of association-level language.
Context Details
Domain
exercise_science
Population
human
Subject
Circulating levels of testosterone, free testosterone, DHT, IGF-1, growth hormone, and other anabolic hormones
Action
are not associated with
Target
muscle hypertrophy in healthy, young, resistance-trained men undergoing 12 weeks of resistance training
Intervention Details
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
The study found that even though guys lifted weights for 12 weeks and got bigger, their hormone levels in the blood didn’t predict how much muscle they gained — only the number of hormone receptors in their muscles mattered.